God, there is some duff advice on here!
OP, your car has done 38000 miles so its very unlikely to have an oil leak. It was serviced a year ago when the oil would have been changed for fresh clean oil.
Its now due a service where it will be checked and changed.
(The reason the oil is changed at a service is that as the engine wears, minute particles of metal get into the oil and make it dirty. The oil is drained from the sump at the service and refilled with the correct oil to the correct level.)
You SHOULD as a matter of course check the oil via the dipstick every month or so, there are markers on the stick for high and low and the oil level should be somewhere in between. Check when the engine is cold and the car on a level surface.
Check your windscreen washer level at the same time, along with tyre pressures and you are all set.
The handbook in your glove box will tell you all this and the correct tyre pressures for normal and heavy load.